chore(deps): bump org.robolectric:robolectric

Bumps [org.robolectric:robolectric](https://github.com/robolectric/robolectric) from 4.15.1 to 4.16.
- [Release notes](https://github.com/robolectric/robolectric/releases)
- [Commits](robolectric/robolectric@robolectric-4.15.1...robolectric-4.16)

---
updated-dependencies:
- dependency-name: org.robolectric:robolectric
  dependency-version: '4.16'
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

packages/secure_storage/amplify_secure_storage/android/build.gradle

@@ -56,6 +56,6 @@ dependencies {
     // See https://github.com/aws-amplify/amplify-flutter/issues/2640
     implementation 'com.google.crypto.tink:tink-android:[1.8.0, )'
     testImplementation 'junit:junit:4.13.2'
-    testImplementation 'org.robolectric:robolectric:4.15.1'
+    testImplementation 'org.robolectric:robolectric:4.16'
     testImplementation 'androidx.test:core-ktx:1.6.1'
 }